I've been through a scenario where I had a very complicated multiple schemas map, the left(source) side of the map had two schemas and the right(destination) side had one, for some reason I decided to add one more schema to the left side. BizTalk map editor in 2006/2006 R2/2009/2010 doesn't allow creating multiple schemas map directly, neither does it allow adding or removing schemas from either side of the map, therefore in order to add a schema, I would have to open an orchestration, create a transform...